
5
Algorithms for Rectification of Geometric
Distortions
A large subset of the input domain of GIS constitutes images obtained from
different sources and sensors. Images of Earth acquired through satellite or
airborne platforms carrying sensors such as RADAR, thermal, infrared (IR),
optical, microwave etc. are major input sources of GIS. All these platforms
carrying the sensors acquire the image of the Earth’s surface corresponding
to the IFOV (Instantaneous Field of View) of the sensors. These images have
both the signature of the objects and the time stamp of the instance of the
image acquired. These images are prone to various errors because of the insta- ...